Distributed Control to Ensure Proportional Load Sharing and Improve Voltage Regulation in Low-Voltage DC Microgrids
Distributed Control to Ensure Proportional Load Sharing and Improve Voltage Regulation in Low-Voltage DC Microgrids
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DOI：
10.1109/tpel.2012.2215055
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发表时间：
2013-04
影响因子：
6.7
通讯作者：
S. Anand;B. G. Fernandes;J. Guerrero
中科院分区：
文献类型：
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作者：
S. Anand;B. G. Fernandes;J. Guerrero
与交流系统相比，直流微电网由于高效率、高可靠性和可再生能源的容易互连而越来越受欢迎。直流微电网的控制目标是：1）确保电源之间的负载均衡（单位）; 2）维持系统的低电压调节。传统的下垂控制器不能有效地同时实现上述两个目标。其原因被确定为标称电压和负载分布的误差。虽然集中式控制器实现了这些目标，但它需要高速通信，并且由于单点故障而提供较低的可靠性。为了解决这些局限性，本文提出了一种新的分散控制器的直流微电网。其主要优点是高可靠性、低电压调节和均衡负载分配，利用低带宽通信。为了评估该方案的动态性能，推导了该方案的数学模型。系统的稳定性由特征值分析来评估。通过详细的仿真研究验证了该方案的有效性。为了确认该计划的可行性，实验研究进行了为此目的开发的实验室原型。控制器局域网协议用于实现源之间的通信。
DC microgrids are gaining popularity due to high efficiency, high reliability, and easy interconnection of renewable sources as compared to the ac system. Control objectives of dc microgrid are: 1) to ensure equal load sharing (in per unit) among sources; and 2) to maintain low-voltage regulation of the system. Conventional droop controllers are not effective in achieving both the aforementioned objectives simultaneously. Reasons for this are identified to be the error in nominal voltages and load distribution. Though centralized controller achieves these objectives, it requires high-speed communication and offers less reliability due to single point of failure. To address these limitations, this paper proposes a new decentralized controller for dc microgrid. Key advantages are high reliability, low-voltage regulation, and equal load sharing, utilizing low-bandwidth communication. To evaluate the dynamic performance, mathematical model of the scheme is derived. Stability of the system is evaluated by eigenvalue analysis. The effectiveness of the scheme is verified through a detailed simulation study. To confirm the viability of the scheme, experimental studies are carried out on a laboratory prototype developed for this purpose. Controller area network protocol is utilized to achieve communication between the sources.